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BOOK IV.

PROP. I. PROB.

In a given circle to place a straight line, equal to a given straight line, not greater than the diameter of the circle.

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PROP. II. PROB.

In a given circle to inscribe a triangle equiangular to a given triangle.

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PROP. III. PROB.

About a given circle to describe a triangle equiangular to a given triangle.

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To construct an isosceles triangle which shall have each angle at the base double of the vertical angle.

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To describe an equilateral and equiangular pentagon about a given circle.

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To inscribe a circle in a given equilateral and equiangular pentagon.

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To describe a circle about a given equilateral and equiangular pentagon.

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